Outdoor air quality detection device

The utility model belongs to the field of air quality detection, and particularly relates to an outdoor air quality detection device which comprises a device main body, a display screen, a ventilation window, a filter sheet, a spring I, a rotating block, a fixed pin, a torsion spring, a rotating plate, a square block, a guide rod, a sliding block, a spring II, a magnetic ring, a magnetic ring I, a magnetic ring II, a spring III, a U-shaped rod and a knob, a filter is mounted in a square hole and extrudes a rotating block, so that the rotating block rotates around a fixing pin, the rotating block rotates to extrude a torsional spring, the filter moves to extrude a first spring, when the filter completely crosses the rotating block, the rotating block rotates and resets under the action of torsion of the torsional spring, and the rotating block rotates and resets under the action of elasticity of the first spring. The filter moves reversely to be attached to the rotating block, the elastic force of the first sp